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Moving UI specific methods from UI Element to either Window, View
or Widget. Once we create common UIElement for UI and Viz it'll be
easier to follow changes since this refactor is done. Common
UIElement will not know about the functions moved in this CL, so I
think it's better to do this now.

Bug: 775348
Change-Id: Ife9d9150ad9de704272c62dc16c177064f4eccdb
Reviewed-on: https://chromium-review.googlesource.com/962356Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Commit-Queue: Illia Martyniuk <illiam@google.com>
Cr-Commit-Position: refs/heads/master@{#543470}